Bulges in the barrel being a used barrel? Had a .243 that got handed to me a while back. Could get a three shot cloverleaf every fourth group or so, just enough to keep you thinking it's got potential...
Gave it a major clean and decopper, and then inspected the barrel really closely and that's how I found it was bulged about 6" back from the muzzle - just enough to allow the proj to 'skip' and reingage the rifling I think was the thing we decided was going on. It wasn't readily noticeable, but enough to go for minute of door instead of minute of deer...
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